<?php
/*
 * @Date: 2021-05-08 13:21:04
 * @Author: yukun
 * @LastEditors: yukun
 * @LastEditTime: 2021-05-08 14:07:03
 * @FilePath: /design-patterns-study/责任链模式/Email.php
 * @Description: 本文件主要功能为：
 */

class Email
{
    protected $lev = 3;
    protected $top = null;

    public function alert($lev)
    {
        echo "级别：{$lev} 邮件报警" . PHP_EOL;
    }
}
